A Peak-To-Average Power Ratio Suppression Method for Broadband LEO Satellite Communication

Abstract

The low earth orbit satellite broadband communication adopts OFDM technology, which not only effectively improves the spectrum efficiency, but also facilitates the integration with the 5G. It has far-reaching significance for the construction of 6G global seamless network. High peak to average power ratio (PAPR) for OFDM produces serious nonlinear distortion and spectrum spread of transmission signal in nonlinear transmission channel. On the one hand, pulse shaping technology is used to reduce the PAPR of OFDM. On the other hand, aiming to improve the linear range of power amplifier, the pulse shaping technology is widely used. Under this circumstance, a method CS-PS-DPD (Combination Sine Pulse Shaping and digital pre-distortion) is proposed to reduce the requirement of high PAPR of OFDM signal to the transmission channel linearity. Simulation results show that this method can effectively improve the performance of low earth orbit satellite broadband OFDM communication system.